Upper Beaver Subwatershed Site M-2 Reservoir Report
Last Updated: December 13, 2025
Upper Beaver Subwatershed Site M-2, located in Monona, Iowa, is a crucial water resource managed by the local government and designed by the USDA NRCS.
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Summary
This earth dam, completed in 1967, serves multiple purposes including fire protection, stock, small fish pond, and flood risk reduction. With a dam height of 43 feet and a drainage area of 1.97 square miles, it has a storage capacity of 128 acre-feet and a surface area of 5.9 acres.
The dam's primary purpose is to provide essential water management for the surrounding area, ensuring safety and sustainability for both human activities and the local ecosystem. Despite its low hazard potential and moderate risk assessment, the dam's condition remains unrated, indicating a need for further assessment and potential maintenance. With state regulatory oversight from the Iowa DNR, including permitting, inspection, and enforcement, this site plays a critical role in water resource management in the region.
While the dam has not undergone recent inspections or condition assessments, its location on TR-BEAVER CREEK and its function as a flood risk reduction measure highlight its importance for water resource and climate enthusiasts. As a key element in the local water infrastructure, Upper Beaver Subwatershed Site M-2 represents a valuable asset for the community's resilience in the face of changing climate conditions and evolving water resource needs.
Year Completed |
1967 |
Dam Length |
305 |
Dam Height |
43 |
River Or Stream |
TR-BEAVER CREEK |
Primary Dam Type |
Earth |
Surface Area |
5.9 |
Drainage Area |
1.97 |
Nid Storage |
128 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
43 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Little Sioux River Near Turin
|
1040cfs |
Maple River At Mapleton
|
323cfs |
Monona-Harrison Ditch Near Turin
|
158cfs |
Soldier River At Pisgah
|
112cfs |
West Fork Ditch At Hornick
|
80cfs |
Missouri River At Decatur
|
15500cfs |
Dam Data Reference
Condition Assessment
SatisfactoryNo existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.
Hazard Potential Classification
HighDams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.
Upper Beaver Subwatershed Site M-2